Percussive tool.



PERCUSSIVE TOOL. APPLICATION FILED MAR. 28, 19:2.

Patented May 4, 1915.

2 SHEETS-SHEET i.

I To (ZZZ whom it may concern.

' masses.

for yieldingly holding the head UhllfTii LEWIS c. BAYLES, or nasgrolv, PENNSYLVANIA, assienor. we INGERSOLL-RANT GGMJE'ANY, OF NEW YORK, N. Y.,

A CORPORATION OF NEW JERSEY.

PERCUSSIYE- T0011.

position serve both as shock absorbers and as looking devices to prevent the displacement of the parts whichsecure the front head to the tool cylinder.

A further object isto provide a spring for use in connection with percussive tools, which spring will serve as a nut or bolt lock as Well as a shock absorber.

Practical embodiments of this invention are represented in the accompanying draw: ings, in'which,

Figure 1 is a side elevation, partly in sec tion, of the front portion of a hammer drill showing the shock absorbing springs interposed between the front head and the nuts of the bolts which secure the front head .to the cylinder. .Fig. 2 is a side view taken at right angles to Fig. 1. -F.igl'3 is an inverted section taken in the plane of the line AA of Fig. 1. Fig. 4C is a side view of one of the springs. Fig. 5 is an end view of the same. Fig. 6 is a side view of the nut. Fig. 7 is an end view of the same. Fig. 8 is a view similar to Fig. 2, with the bolt reversed and the shock absorbing spring interposed between the bolthead and the front head, and Fig. 9 is aninverted section taken in the plane of the line BB of Fig. 8.

The tool cylinder is denoted by *1, the

piston by 2, the anvil block by 3, the drill steel by 4, the front head by 5 and the bushing which holds the anvil block and which is interposed between the cylinder and front head, by (i. The bolts for securing the front head to the hammer cylinder, are denoted by 7, the heads of said bolts by 8, their screw'thr eaded ends by 9, and the nuts thereon by 10.

The springs which surround the bolts 7, are denoted by 11, and each spring comprises a plurality of coils. The outer end coil of the spring provided with a projection 12, and the inner end coil of the spring is provided with a projection 13. The bolts 7 pass through flanges 14, 15, on the adjacent Specification of Letters Patent. Application filed March as, n12.

block in curately ad ust Patented May it, 1915. Serial No. 686,888.

ends of the cylinder and front head. The outer face of the flange 15 on the front head is provided with a recess 16', for the reception of the projection 13 on the inner end coil of thesprin ll. I

In the form s own in Figs. 1 to 7 inclusive, the inner face of the nut 10 is provided with a recess llhrranged to receive the projection 12 on the outer end coil ofthe spring 11. In this form the bolt is held from turning by the engagement of its head with the cylinder 1. The anvil block 3 projects into the piston chamber of the cylinder 1, suifi-.

cientlytoprevent the piston 2 from striking the bushing 6 when the steel 4- is removed, the anvil block being arranged to be driven forwardly by the piston until it strikes the front head 5, so that the front head, the

anvil block and the shock absorbing springs 1 are theonly'parts which yield under the impact of the piston.

In assembling the parts, as the nut 10 is rotated on the screw-threaded portion 9 of the bolt 7, the projection 12 on the outer coil of the spring 11 will be alternately forced into and out of the recess 17 in the inner face of the nut. The engagement of the projection 13 on the inner end coil of the spring with the recess 16 in the flange 15 of the front head, will serve to prevent the spring from turning as the nut 10 is turned. The turnin of this nut 10 will serve to acthe tension of the spring 11 and thereby the yielding resistance of the front head to the blows of the piston and anvil block. It will thus be seen that the springs 11 serve both as shock absorbers and as bolt and nut locks.

In the form shown in Figs. 8 and 9, the bolts 7 are reversed and the nuts 10* are held from turning by their engagement with the cylinder 1. In this form, the inner face of each of the heads 8* of the bolts 7, is provided with a recess 18 for receiving the projection 12 on the outer end coil of the spring 11. In assembling the parts, the bolts are turned in the nuts and Whenbrought into the proper position they will be locked in such position by the engagement of the projeetions 12 in the recesses 18 and the projections 13 in the recesses 16.

' What I claim is:

1. A percussive tool including a cylinder, its front head and their bolts passing through said flanges, nuts on and the front head flange,

said bolts beyond the front head flange, and coil springs interposedbetween said nuts and the front head flange, outer end coils of whichs'prings' have projections'thereon, said front head flange and said nuts having recessesfor receiving the pro ect10ns on the innerand outer end coils of the springs, whereby the springs-serve the double function of shockabsorbers and nut locks. I

2I percussive tool including a cylinder, its front head and their adjacent flanges, bolts passing through said flanges, nuts on said bolts beyond the front .coil springs interposed. between said nuts the inner and the inner andq' 'of'the coils,

as my invention, presence of two witnesses,

head flange, and.

outer end coils of which springs have rojections thereon at a distance from the ends said front head flange and said i 

